@Kirbydogs, The Acekard 2i has been my all time favourite after I joined the scene. It doesn't eat up the battery life, games don't need patching when it comes to those with anti-piracy measures, and works with up to a 32GB microSD card.
@Xdqwerty, Bad, and I mean, really bad. Excluding the EZ-Flash IV and Omega DE, they're quite cool but has its flaws. Original omega model corrupts save files after not waiting for a few seconds after saving your game.